Abstract
An FeO-SiO2-CaO-Na2O quaternary slag with low melting point was developed for the bath-smelting reduction of Sb2O3. First, the optimum composition of the designed slag was determined through practical experiments to be 36.2% FeO, 31.9% SiO2, 12.0% CaO, and 20.0% Na2O, such that FeO/SiO2 was 1.14. The effects of the main variables influencing the yield and content of antimony in the smelting slag were investigated in detail for the content-optimized slag, and the following optimum smelting conditions were determined: smelting duration of 50 min, rate of coke, i.e., coke dosage of 12.5 wt.%, and smelting temperature of 1000°C. These conditions enabled high recovery of antimony, > 92.0%, and low antimony content in the slag of around 0.97%; the values of both these parameters are superior to those achieved by existing processes.
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